O2 sensor question
 

for my 84 944:

I Failed Nevada emissions (horribly) CFC and Co2 levels were nearly double (especially at idle) Car is running a bit rough and idling at about 750 RPMS.

First thing I'm going to do is change out the o2 sensor.. The car started life in CA and has been there (I believe) most if not all of its life. It lives in Vegas now, and I was wondering if

1) Does it have a CA o2 sensor installed (how can you tell?)

2) Can I replace it with a standard (non-CA) o2 sensor?

3) would it be (better) if I put the more expensive CA o2 sensor in?


Thanks!!

-9

Ok, a little research and I see that, since my O2 sensor has 3 wires coming off of it, it IS a CA O2 sensor (bummer).

A little more research and I see that the 2 extra wires are for heating the sensor..

So, with that said, one question still remains, do I NEED to get the CA replacement O2 sensor or can I now use the regular single wire type now that the car is in Nevada?

Thanks again

-9

If your car came with a heated sensor, then you should put a heated sensor back in. It's not a California sensor, it's how they have the computer set up to work with the sensor. Put the three wire back on there. There are some that try a generic sensor and I'm not sure how well they work as I've always used the OEM, but do a search on here and that will provide the part number of the generic part number. If you can't find it, let me know and I'll look it up. I think it was on FR Wilk's site as well.

Thanks Razorback.. I don't want to spare any expense if it will sacrifice performance. I'll get the OEM. It would have been nice if the car had the cheaper one, lord knows I have bigger fish to fry on this car and dollars will go to it one way or another. I'm hoping to make this old gal into a awesome machine again, so I'll pay whatever it takes to do it.. One part at a time..

-9

Come on guys! Co2 is what you exhale. CO is what cars (or most anything burning) emits.

And what the heck is CFC's??? Chlorinated Fluro Carbons??? Didn't know that A/C systems were tested as part of the emissions.

ive heard of guys doing a straight swap and install with the ford 3 wire O2 sensors, they fit, all you need to do is splice the wires on... i havent tried it yet but i understand its a compatible swap. (the ford sensor i think is around 50 bucks?)

Ok socal, I get the point.. I made a mistake in phraseology. Thanks for correcting me, I'll never do it again.. I think everyone understood the problem. I'm glad you got to flex your superhuman automotive knowlege and make me look stupid..

I'm not a professional mechanic and never claimed to be. Just an amateur hobbyist who enjoys porsches.

EMB Pilot, who you work for? Me, Allegiant Air... Former Allegheny, Shuttle America, Mesa (in that order) furlough fodder... Just upgraded on the -80 at AAY..

Pm sent ;) welcome to the board nine, let us know what you end up doing.

This is one at a cheap cheap price and worked perfect. http://cgi.ebay.com/ebaymotors/BECK-ARNLEY-OXYGEN-SENSOR-1983-1991-PORSCHE-944_W0QQitemZ190104066085QQihZ009QQcategoryZ33557Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

I had a nasty smog test, changed the o2 sensor with the one linked above and passed with flying colors. Nearly cut all my numbers in half.

You are not the only one that is confusing a single molecule of oxygen with two molecules. The difference in the Latin di for two and mon for one. Better get past your thin skin when confronted with misunderstandings. These are hobbiest cars as few who own them have the income to take them to a P-car mechanic and do most of their own wrenching.

As to your "CFC" statement; most likely HC's or hydrocarbons. This is the unburnt fuel coming out the tail pipe. The catalytic converter is supposed to catch most of the HC's and CO's and NO (also NOx - nitric oxides or nitrogen with an oxygen molecule or "rusted" nitrogen) before they reach the end of the tailpipe.

http://en.wikipedia.org/wiki/Nitrogen_oxide

http://en.wikipedia.org/wiki/Catalytic_converter

Back to CO and CO2: Yes there is CO2 that comes out of the tailpipe. BUT! Until recently it's not been considered in the testing regime for automobiles. Thank you ALGORE.

Now we can also have a discussion on down wind turns.

I put in a generic bosch. I don't recall which model, I found the info on the 'other' forum I believe.

If you need me to dig through my records to find the model, I can. Just let me know.

do a search in the turbo 944 section here. the exact part number is listed for a ford 3 wire. i used one, it works great.

CO is what burning things emit when there is not enough O2 and there is an incomplete burn.

CO and HC levels.. Got it.. I left the failed emmissions print out in the car and attempted to post from memory.. I didn't give it much thought obviously before I hit the send button.

If you have the print out post the results of your test.

Gives the rest of us ideas as to which way your emissions have shifted. Sometimes just an O2 sensor does the job. Sometimes it's the AFS, or temp sensor, or just a vacuum leak.

for the love of pete this guy needs an oxygen sensor and you guys are hanging him out to dry on semantics! sheesh. ive never seen anything like this on our forum before, especially to a new guest! relax. and i can assure you, -9 has thicker skin than most, trust me. its part of the gig.


Nice find! i may just try that one out, or the ford. i think for good measure im going to try and change mine out as well.


NyNor , it looks like the one you used matches the one i just put in my explorer. u just cut the wires and crimped them? quick job?

yeah, piece of cake. took 15 minutes, tops.

Pulled the old one off today and the wires were brittle and cracked all the way to the connector.. Rather than screw with splicing the wires to the universal, I decided to just replace the whole damn thing with the OEM Bosch 13001. Did some shopping and found it cheapest (129.00) at Partstrain.com.

ouch

if you're going to do that every time you buy parts - you're going to be bending over a whole lot.

Good call. Sometimes that is the smartest way to go.

OK... Here are the results of my failed emissions test:

RPM 2500 - HC PPM 203 (Limit 220) PASS / CO 1.33 (Limit 1.20) FAIL
CO2 14.0%, O2 1.5%

RPM Idle (778) - HC PPM 541 (Limit 220) FAIL / CO 2.54 (Limit 1.20) FAIL
CO2 14.4, O2 1.8

So apparently 2500 RPM is close to passing and idle is terribly out of limits.. Gut tells me that it's got to be the O2 sensor right? seems like its very rich at Idle..

Should have the part next week.

What's that? Buying the expensive OEM?

-9

does seem rich to me. likely it is the O2 sensor. i suppose it could also be the temp sensor.

Check your tps adjustment as well if it is not adjusted right it will overide the idle map.

Re: O2 sensor question
 

Splice in a Bosch 13913 O2 sensor! Remember to crimp the connection, no solder.
Rough running you may want to unplug the sensor to see if the car runs better .. if it does then it is the O2 sensor... if it doesn't you have other problems you should make sure you do a tune up if you have not already done so and check for air and vacumn leaks.